Berlin 2018 – scientific programme

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O: Fachverband Oberflächenphysik

O 114: Nanostructures at surfaces: 1D and 2D structures and networks IV

O 114.4: Talk

Friday, March 16, 2018, 11:15–11:30, MA 141

Investigation of stepwise crosslinked 4-terphenylthiol self-assembled monolayers — •Patrick Stohmann, Sascha Koch, Yang Yang, Christopher David Kaiser, and Armin Gölzhäuser — Department of Physics, University of Bielefeld, Universitätsstraße 25, 33615 Bielefeld, Germany

When aromatic self-assembled monolayers (SAMs) are electron-irradiated, intermolecular crosslinking leads to the formation of Carbon Nano Membranes (CNM) with molecular thickness [1]. The present investigation focuses on the structural transformation from a pristine 4-terphenylthiol (TPT) SAM on Au(111), comparable to previous experiments [2], to a fully crosslinked molecular film, induced by a stepwise increase of the 50 eV electron irradiation dose. The amorphism of the respective partially crosslinked films is investigated by means of scanning tunneling microscopy (STM) at UHV conditions. Electron-induced chemical modifications of the molecular layer and the layer-gold interface as well as the change in the molecular order are investigated by X-ray photoelectron spectroscopy (XPS) and low energy electron diffraction (LEED), respectively.